游戏数据库存储年末优惠活动

CREATE TABLE promotions (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    description TEXT,
    start_date DATETIME NOT NULL,
    end_date DATETIME NOT NULL,
    discount_rate DECIMAL(5, 2) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

from sqlalchemy import create_engine, Column, Integer, String, Text, DateTime, DECIMAL, TIMESTAMP
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from datetime import datetime

Base = declarative_base()

class Promotion(Base):
    __tablename__ = 'promotions'
    id = Column(Integer, primary_key=True)
    name = Column(String(255), nullable=False)
    description = Column(Text)
    start_date = Column(DateTime, nullable=False)
    end_date = Column(DateTime, nullable=False)
    discount_rate = Column(DECIMAL(5, 2), nullable=False)
    created_at = Column(TIMESTAMP, default=datetime.utcnow)
    updated_at = Column(TIMESTAMP, default=datetime.utcnow, onupdate=datetime.utcnow)

engine = create_engine('mysql+pymysql://user:password@host/dbname')
Base.metadata.create_all(engine)
Session = sessionmaker(bind=engine)
session = Session()

# 添加新的优惠活动
new_promotion = Promotion(
    name="年末大促",
    description="全场商品8折优惠",
    start_date=datetime(2023, 12, 1),
    end_date=datetime(2023, 12, 31),
    discount_rate=0.8
)
session.add(new_promotion)
session.commit()

# 查询优惠活动
promotions = session.query(Promotion).filter(Promotion.start_date <= datetime.now(), Promotion.end_date >= datetime.now()).all()
for promo in promotions:
    print(f"{promo.name}: {promo.description}, 折扣: {promo.discount_rate * 100}%")